/**
 * Licensed to the Apache Software Foundation (ASF) under one or more
 * contributor license agreements.  See the NOTICE file distributed with
 * this work for additional information regarding copyright ownership.
 * The ASF licenses this file to You under the Apache License, Version 2.0
 * (the "License"); you may not use this file except in compliance with
 * the License.  You may obtain a copy of the License at
 *
 *     http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */
package org.apache.nutch.webui.client.impl;

import java.util.List;
import java.util.UUID;

import org.apache.nutch.webui.client.model.Crawl;
import org.apache.nutch.webui.client.model.JobInfo.JobType;
import org.joda.time.Duration;
import org.springframework.beans.factory.config.BeanDefinition;
import org.springframework.context.annotation.Scope;
import org.springframework.stereotype.Component;

import com.google.common.collect.Lists;

@Component
@Scope(BeanDefinition.SCOPE_PROTOTYPE)
public class RemoteCommandsBatchFactory {

	private List<RemoteCommand> remoteCommands;
	private Crawl crawl;

	private String batchId;

	public List<RemoteCommand> createCommands(Crawl crawl) {
		this.crawl = crawl;
		this.remoteCommands = Lists.newArrayList();

		remoteCommands.add(inject());
		for (int i = 0; i < crawl.getNumberOfRounds(); i++) {
			remoteCommands.addAll(createBatchCommands());
		}
		return remoteCommands;
	}

	private List<RemoteCommand> createBatchCommands() {
		this.batchId = UUID.randomUUID().toString();
		List<RemoteCommand> batchCommands = Lists.newArrayList();

		batchCommands.add(createGenerateCommand());
		batchCommands.add(createFetchCommand());
		batchCommands.add(createParseCommand());
		batchCommands.add(createUpdateDbCommand());
		batchCommands.add(createIndexCommand());

		return batchCommands;
	}

	private RemoteCommand inject() {
		RemoteCommandBuilder builder = RemoteCommandBuilder
				.instance(JobType.INJECT).withCrawlId(crawl.getCrawlId())
				.withArgument("seedDir", crawl.getSeedDirectory());
		return builder.build();
	}

	private RemoteCommand createGenerateCommand() {
		return createBuilder(JobType.GENERATE).build();
	}

	private RemoteCommand createFetchCommand() {
		return createBuilder(JobType.FETCH)
				.withTimeout(Duration.standardSeconds(50)).build();
	}

	private RemoteCommand createParseCommand() {
		return createBuilder(JobType.PARSE).build();
	}

	private RemoteCommand createIndexCommand() {
		return createBuilder(JobType.INDEX).build();
	}

	private RemoteCommand createUpdateDbCommand() {
		return createBuilder(JobType.UPDATEDB).build();
	}

	private RemoteCommandBuilder createBuilder(JobType jobType) {
		return RemoteCommandBuilder.instance(jobType)
				.withCrawlId(crawl.getCrawlId()).withArgument("batch", batchId);
	}

}
